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Articles by A.M. Tahmasbi
Total Records ( 7 ) for A.M. Tahmasbi
  H.A. Ghasemi , A.M. Tahmasbi , Gh. Moghaddam , M. Mehri , S. Alijani , E. Kashefi and A. Fasihi
  An experiment was performed to assess the potential of microbial phytase and Saccharomyces cervisiae (Sc47) on improving the utilization of phytate P and subsequently on broiler performance fed wheat-corn-soybean meal basal diet from 7 – 49 day of age. A 3x2x2 factorial arrangements of treatments were used: 3 levels of Sc47 (0.0, 0.1 and 0.2 % of diet); two levels of phytase (0 and 800 U / kg of diet) and two levels of nonphytate P (50% and 100% of NRC (1994) recommended). Each treatment contained 3 pens with 15 birds/pen. Measurements included body weight gain (BWG), feed conversion ratio (FCR), serum parameters, Tibia ash, P and Ca retention. During the experimental periods effects of Non phytate phosphorous (NPP) levels on all measured parameters was significant (P< 0.01). Phytase inclusion at 800 U/kg of diet induced improvement (P< 0.05) in BWG, FCR, tibia ash, P and Ca retention and also increased concentration of serum P and protein (p< 0.05). Inclusion phytase on the diet containing the 50% NRC (1994) NPP resulted improvement on the utilization of phytate P and Ca by increasing P and Ca retention which led to an increase in toe ash content. The experiment demonstrated dietary supplementation of Saccharomyces cervisiae had a positive influence on the bird`s performance. However, significant improvement (P< 0.05) was observed in BWG and FCR during starter phase in chickens fed the diets containing Saccharomyces cervisiae. Maximum responses to live yeast achieved when broiler chicks were fed diet with 100% NRC (1994) recommended available phosphorous. In conclusion, the finding of this study suggested combination of supplemental phytase and live yeast (Sc47) had some beneficial effects on improving the nutritive value of broilers diets in particular in the low level of NPP.
  A.M. Tahmasbi , E. Kashefi , Gh. Moghadam , A. Taghizadeh and H.A. Ghasemi
  An investigation was made to find out the importance of β-adnergenic and lysine on carcass characteristics and blood metabolite of 648 broiler chickens from 21- 42 days of age. Effect of metaproterenol (a β2- adrenergic agonist) and lysine were assessed by mixing them in feed at 0.0, 0.25, 0.50 and 1.00 ppm metaproterenol sulfate and 100%, 115% and 130% of NRC recommended lysine in a 4x3 factorial arrangement of treatments. Chickens were reared under normal condition to 3 week of ages and then randomly allocated to treatments. Each treatment contained 3 pens with 18 birds/pen. Body weight gains (BWG), feed conversion ratio (FCR) abdominal fat pat (AFP) breast weight (BW) were measured. Result indicate that during 4th and 5th week of study using metaproterenol (0.5 ppm ), compare to control group, improved BWG (5.1%), carcass efficiency (3.4%) and breast weight (2.2%), breast and thigh muscle protein and depressed abdominal fat (P< 0.05). Increasing lysine levels lead to significant increase in body weight gain, carcass weight, carcass efficiency, breast muscle weight (P< 0.5), but it has no effect on feed intake, feed conversion ratio, blood metabolites. Data from this experiment suggested that both adding 0.5 ppm β-adrenergic agonist metaproterenol sulphate significantly improved birds performance and their carcass quality and the most efficient lysine level for broiler chickens was proved to be 115% NRC recommended.
  A. Taghizadeh , M. Hatami , G.A. Moghadam , A.M. Tahmasbi , H. Janmohamadi , N. Pirani and R. Noori
  The effects of chemical treated corn silage (using urea and formaldehyde) on rumen ecosystem (pH, sedimentation and floatation, methylene blue reduction, total VFA, rumen ammonia) and blood metabolites (urea and glucose) in sheep were investigated. Sixteen sheep (41.85±4.6 kg) were used in a 4-treatment completely randomly design. The treatment contented: Corn Silage (CS), Corn Silage treated Urea(10 g kg-1)(CSU), Corn Silage treated Formaldehyde(4 g kg-1) (CSF), Corn silage treated urea (10 g kg-1) and formaldehyde (4 g kg-1) (CSFU). The ruminal pH had significant differences between treatments (p<0.05). The sedimentation andfloatation time, methylene blue reduction, total VFA showed no significant differences between treatments. The ruminal ammonia nitrogen in CUS was significantly more than the other treatments. The blood urea nitrogen in CSU and CSFU was more than the other treatments (p<0.05). There was no significant differences for blood glucose concentration among treatments. This study indicated that formaldehyde decreased ruminal ammonia nitrogen, resulting high escaped protein and offer users flexibility in formulating rations according to the productive performance of target animals.
  A.M. Tahmasbi , H. Galbraith and J.R. Scaife
  Responses of biotin in the pre-ruminant and immediately post-ruminant kids were studied in an experiment using 6Angora and 8 Scottish Cashmere male castrated kids. They were allocated into two equal groups and given a good quality biotin supplemented milk replacer up to 42 days of ages and then they allocated to continue to receive the biotin adequate diet or a diet without supplemented biotin and containing the biotin-binding protein avidin in dried egg white up to 84 days of ages. Thereafter all kids were continued to receive a progressively reducing quantities of the milk diet and in addition a commercial creep feed and chopped hay ad libitum. After weaning at 18 weeks of age, they received chopped hay (0.75) and concentrate (0.25) ad libitum to the end of the study at 24 weeks. Responses in live weight gain, dry matter intake, fibre characteristics, hair loss by combing, Plasma biotin and level of glucose, urea and PCV were measured through the experimental periods. The result indicated that at the end of the pre-ruminant period, biotin deficiency had a significant effect on reducing live weight gain (p< 0.05), feed intake (p< 0.01) and increasing combed hair loss (p< 0.001). Total hair loss of mohair due to biotin deficiency was significantly (p< 0.01) higher than cashmere. Following the introduction to solid feed there were no differences in animal performance due to diet. Total clean fibre yield by Angora goat in all periods was significantly (p< 0.001) higher that for the Cashmere goats. While biotin supplemented milk replacer diet increased plasma biotin concentration this did not result in any significant increase in glucose, urea and PCV in all periods of study. However, during solid feeding Cashmere kids had a significantly higher live weight gain (p< 0.05) and dry matter intake (p< 0.01) than Angora kids. Difference between two genotypes was noted during soild feeding in superior values of feed intake(0.01), live weight gain (p< 0.01), glucose concentration (p< 0.001) and PCV% (p< 0.001) in Chashmer than Angora goats.
  M. Kazemi , A.M. Tahmasbi , R. Valizadeh , M. Danesh Mesgaran and A.A. Naserian
  An experiment was carried out to evaluate the substitution of Barley distillers' Grains (BG) ensiled by different level molassed sugar Beet Pulp (BP) with of corn silage on milk production and health of dairy cows. A total 18 Holstein dairy cows (86±10 days postpartum 600±20 kg BW), were randomly assigned to 3 treatments in a balanced completely randomized design (repeated measures). Three diets were formulated to evaluate the replacement of 30% corn silage by an ensiled mixture of BG with and without BP. Treatments were an ensiled mixture of 60% BG with 40% BP (BGBP40%), an ensiled mixture of 80% BG with 20% BP (BGBP20%) and BG ensiled without BP (BGBP0%). Experimental diets contained, 40% forage (60:40, corn silage: Alfalfa hay) and 60% concentrate. Cows were fed a total mixed ration and milked 3 times daily. Diet concentrations of NDF, ADF and CP were 33.2, 19.6 and 16.4% DM (for BGBP40%), 33.7, 20 and 16.8% DM (for BGBP 20%) and 33.8, 20.5 and 16.8% DM (BGBP 0%), respectively. The feed intakes, daily milk yield and milk composition were not significantly different between treatments. There was no significant effect of treatments on rumen pH and NH3-N. Also, there was no significant effect on blood plasma metabolites. Partial substitution BG ensiled with or without BP for corn silage did not have any negative effect on the performance of Holstein dairy cows.
  A. Taghizadeh , M. Hatami , G.A. Moghadam and A.M. Tahmasbi
  Samples of unfractionated forage, isolated NDF and residue insoluble in 90% Ethanol were fermented in vitro and gas production was monitored. The gas volume associated with the ethanol soluble (A fraction) was determined as the difference between the gas from the whole forage and from the ethanol residue.The gas yield associated with the fraction insoluble in 90% ethanol but soluble in neutral detergent soluble (B1 fraction) was determined by subtracting the isolated NDF gas curve from the corresponding ethanol residue curve. This experiment included untreated Corn Silage (CS) and chemically treated corn silage. The rate of gas formation from the A fraction was approximately rather than (p<0.05) the B1 fraction. The gas production of A fraction was less than (p<0.05) the B1 fraction. The CS was treated with urea (10g kg-1) or formaldehyde (4g kg-1). Cumulative gas production was recorded at 2, 4, 8, 12, 16, 24, 36, 48, 72 and 96 h of incubation and McDonald equation was used to describe the kinetics of gas production. Treatment with urea decreased (p<0.05) gas production at 96 h by 217.6 vs 236.7, 240.0, 232.56, 254.0 (mL g 1) for CS, Formaldehyde treated (CSF), urea and formaldehyde treated (CSFU), residue insoluble in 90% ethanol (EIR) and isolated NDF, respectively. The maximum rate of gas production decreased (p<0.05) in CS from 0.028 to 0.023, 0.025, 0.027, 0.0235 and 0.0268 for CSU, CSF, CSFU, EIR and isolated NDF, respectively. The gas production of soluble and insoluble fractions (a+b) decreased (p<0.05) from 261.8 in EIR to 241.8, 240, 225.0 238.7 and 239.3 mL g 1 for CS, CSU, CSF, CSFU and isolated NDF, respectively. The gas production at 96 h in EIR was (p<0.05) rather than the other treatments. Associative effects were calculated as the difference between the observed gas production for mixture of urea and formaldehyde and the individual inclusion (urea or formaldehyde). Associative effects generally observed as decreasing of gas production with duration of incubation. The strong correlation between extent of gas production in incubation times and on dry matter in situ disappearance was obtained. The poor correlation in initial times between gas production and in vitro dry matter and in situ dry matter disappearance observed resulting the improved production of in vitro and in situ dry matter disappearance from gas production in later times of incubation due to all potential components were fermented and produced gas. It is concluded that the associative effects cause decreasing of gas production specially in CSU and also resulted the difference between of the gas formation and the rate of gas production of the A fraction and the B fraction. There is strong positive correlation between gas production with in vitro and in situ dry matter disappearances.
  A.M. Tahmasbi , H. Galbraith and J.R. Scaife
  An experiment was conducted to develop an in vitro technique to study the role of biotin in controlling growth and viability of sheep wool follicles. Small samples of skin wee taken from mid-rib are of three Suffolk wether lambs and after discarding epidermal layer, anagen secondary wool follicles were isolated from the dermal layer and maintained in William`s E Medium supplemented with 0.0,0.25 or 0.5 mg L 1 biotin. The results showed significantly increase in vitro wool shaft elongation up to 144 h culture in media. There was no significant differences between rate of fibre elongation of viable cultured follicles. Biotin supplementation significantly increased the proportion of follicles remaining viable after 72 h with the order of response of 0.5>0.25>0.0 mg L 1 supplement. ATP concentration in follicles maintained in the medium containing 0.50 mg L 1 biotin were significantly (p< 0.01) higher than those maintained in medium containing 0.0 or 0.25 mg L 1. Hair follicles maintained in the presence of 0.5 or 1.0 mg L 1 biotin exhibited a significantly (p< 0.01) higher incorporation of [U-14C] Leucine into protein than in follicles in unsupplemented media. DNA concentration per follicle was not affected by biotin concentration. Visual examination of the bulb of hair follicles confirmed the occurrence of mitotic bodies in the matrix of follicles and indicated the presence of viable cells in growing follicles after 144 h of incubation. An examination of cell proliferation sites, using Brdu, in the hair follicles maintained in the presence of 0.0 or 0.50 mg L 1 biotin showed that majority of mitotic activity was concentrated in the bulb adjacent to dermal papilla and outer root sheath in fresh and growing follicles, up to 72 h incubation in different treatments.
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